US3769046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot topping
Assignee: Individual
•
Filing: 1972-04-05
•
Granted: 1973-10-30
•
Expires: 1992-04-05
Abstract
Abstract In the casting of metals, the use of compatible exothermic hot topping material in compressed agglomerated form, having an ignition time greater than five minutes, reduces air pollution and safety hazards and permits reuse of the riser material.
Inventors
- 👤 J Sprinkle
- 👤 S Misitano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:13
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
15 words
A material as in claim 1 which is in the shape of briquettes or pillows.
References Cited (Backward Citations)
GB673605A
Cited
US2791816A
Cited
US2805145A
Cited
US3025153A
Cited
US3326701A
Cited
US3662809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |